Illustration of Boulder Dam, later called Hoover Dam, construction. Caption reads: "A close-up, showing construction detail, Boulder Dam, Colorado River."
Caption on right of postcard reads: "The highway across the crest of Boulder Dam from the Arizona side." Boulder Dam was officially re-named Hoover Dam in 1947.
An image of Rotary Club members listening to speeches during a luncheon at the Nevada viewpoint at Boulder Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of two unidentified men shaking hands during the decennial ceremony in an auditorium at Boulder Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An artist's color rendering of Hoover (Boulder) Dam construction midway through progress. Printed text on front of postcard: "Looking upstream, Colorado River, Boulder Dam."
Black and White photographic postcard showing construction workers, cranes, and cement forms on Hoover (Boulder) Dam. Text on front of postcard: "Boulder Dam- Jan. 1934."
Unidentified people standing at the crow's nest above the site of Boulder Dam, later known as Hoover Dam. "Crows Nest, Site of Boulder Dam" is inscribed on the photo.
Illustration of Boulder Dam, later called Hoover Dam, with the view of lower portals and diversion tunnels. The caption reads: "Boulder Dam, looking upstream, showing Colorado River."